Look at my "C" Box

[MrGrey]

Got these pics from LEAF. According to Leading Edge the damage is from corrosion. The damage could have been from long ago when improperly stored. The box is a little antiquated but in my eyes looks no worse than other boxes I have seen, but I am not an expert when it comes to metals. I asked how long one could use this gearbox and they said too hard to tell. It does not meet like new specs, but hard to tell how significant damage really is. It is likely that this box had 120 hours on Rons Dominator in this condition and never showed any signs of failure. Lemme know what you think if you have any knowledge with gear boxes. Here is what Leading Edge wrote.

Img_6073: This is the portion in which the smaller propshaft bearing rides. You can see that there is definate material loss.

Img_6074: This is the outer gearbox cover. You can see from the picture that this is the older type of housing which only has 4 holes for the bearing retainer and not 6, which makes the retainer update service bulletin uncompliable.

Img_6075: This shows pitting of the case hardened surface of the drive gear. Unfortunately the gears must be replaced in sets, preventing the replacment of just the drive gear.

Img_6076: This shows some of the material loss on the surface of the bearing. This is the bearing which rides on the damaged portion of the prop shaft. ref: Img_6073 This damage will only increase with continued use.

Img_6078: This shows the older style coupling flange which is not compatible with the new seal type. Installing this coupler with the new style seal will result in leaks.

It appears that at one time corrosion occured in the box. The coating loss of the drive gear and material loss on the prop shaft definately look corrosion related. Additionally, the races of 2 other bearings feel rough and appear to be dull indicating some material loss or overheat.

 

[CLS447]

What made you investigate in the first place ?

Good thing you did !

 

[MrGrey]

a seal was leaking at the coupling flange and needed replacement and I did not have the tools to do so.

 

[scottessex]

I'd have Ron give me my money back.........:tape:

 

[MrGrey]

I'd have Ron give me my money back.........:tape:

Yeah kinda stings. But he had no idea, and was likely flying with it in this condition for the entire time he had it... although astonished it was not noticed when the gear ratio was changed.

 

[GyroRon]

I would forward those pictures to Kerry at Lockwood for a second opinion